Five tracks from forthcoming episodes premiered on the show's Facebook page on Wednesday evening (September 5).

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Guest star Kate Hudson will perform a mash-up of 'Dance Again' by Jennifer Lopez and 'Americano' by Lady GaGa, while Kevin McHale and Darren Criss will duet on a medley of 'Boys' by Britney Spears and 'Boyfriend' by Justin Bieber.
Heather Morris will tackle another Spears track, covering 'Gimme More' in the show's second Britney Spears-themed episode.
Criss's version of 'It's Time' by Imagine Dragons also debuted, along with a cover of Carly Rae Jepsen's 'Call Me Maybe' performed by various cast members.
Glee's fourth season will premiere on Thursday, September 13 at 9/8c Fox in the US. The show airs on Sky1 and Sky1 HD in the UK.
Watch a promo for season four of Glee below:
Photo gallery - 'Glee' season four character portraits:
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